DE102006031718A1 - Rolling bearings with integrated rotary encoder - Google Patents

Abstract

The The invention relates to a rolling bearing (1), with at least one first radially outer bearing ring (3) and at least one second radially inner bearing ring (4a, 4b), with at least one rolling element row guided between them in raceways (5a, 5b) and at least one angle sensor (8) for detecting the angular position and / or the relative speed between the mutually corresponding Bearing rings (3; 4a, 4b), wherein the at least one angle sensor (8) on the one hand a plastic-bonded, ferromagnetic material (9) having, which in an annular Recess (10) or groove of a bearing ring (4a) is received, and second, at least one of the plastic-bonded, ferromagnetic Material (9) associated sensor (11), which at the other Bearing ring (3) or on a rolling bearing (1) adjacent component supported is.

Description

Field of the invention

The The invention relates to a rolling bearing with the features of claim 1.

Background of the invention

since For some time, it has been known, directly on a rolling bearing, a speed or rotation angle measurement make.

So will in the DE 42 07 324 A1 proposed a so-called pulse roller bearing, which allows the non-contact detection of rotational speeds by magnetic means. In essence, it is provided that the outer or the inner race of the bearing in the circumferential direction in each case at equal intervals successively arranged regions of different magnetic properties, and on the outer or inner race on a radial peripheral surface or an axial end face at equal intervals one behind the other a magnetic field shielding material, such as a foil, is arranged. The rotation of the corresponding trained race is converted into electrical signals by means of a sensor which detects the constantly changing magnetic field strengths.

From the DE 195 13 669 A1 Furthermore, a hydrostatic pump or a motor with a drive or output shaft is known, which is mounted in a housing and rotatably connected to a Zählkranz for speed and / or position monitoring. The Zählkranz can be made of a metallic material and be encapsulated with a polymeric material. Likewise, the Zählkranz made of a polymeric material and be provided at regular intervals with distributed around its circumference metallic deposits. Finally, it is proposed in this document that the Zählkranz is made of different polymeric materials by two-component injection molding, wherein a component has metallic properties.

Object of the invention

Of the Invention is based on the object, a rolling bearing with at least one Angle encoder for detecting the angular position and / or the relative speed to create between the mutually corresponding bearing rings, which is easy and inexpensive is manufacturable as well as for the mentioned angle encoder requires a minimum of space.

Summary of the invention

outgoing from a rolling bearing, with at least a first radially outer and at least a second radially inner bearing ring, at least one between the same arranged in raceways rolling element row and at least one angle encoder for detecting the angular position and / or the relative rotational speed between the mutually corresponding bearing rings, said Task solved by that the at least one angle encoder on the one hand a plastic-bound, ferromagnetic material, which in an annular recess or groove of a bearing ring is received, and on the other at least one associated with the plastic-bonded ferromagnetic material Sensor includes, which on the other bearing ring or on a rolling bearing supported adjacent component is.

by virtue of the fact that the ferromagnetic material, so to speak in the outer contour the bearing ring is integrated, is the required Installation space in the warehouse advantageously minimized. Furthermore, material and Weight savings and savings in the production of the bearing itself To record, as the recess or the groove extremely simple using standard production technologies.

advantageous Further developments or embodiments of the invention are described in the subclaims.

So can the annular Recess or groove within a lateral surface and / or an end face of the be arranged or formed respective bearing ring.

Of Further, it is suggested that the plastic bonded, ferromagnetic Material, a fabric and / or form closure with the relevant Detailed bearing ring, according to a known injection molding in the annular Recess or groove is introduced.

As the invention further provides, is the magnetization of the ferromagnetic Material during the injection of the same into the recess or groove by means of Injection tool or in a separate step after performing the Injection process realized.

Likewise, it may also be advantageous that a plurality of separately manufactured ring sections of ferromagnetic material within the recess or groove material and / or form-fitting and / or fixed by means of known mechanical fasteners. Said separately manufactured ring sections are both present as well as after their assembly magnetizable.

Farther can the ferromagnetic material, forming an angular scale, with a pole pair number "1" or a multiple be magnetized by it.

Further It is suggested that between the plastic-bonded, ferromagnetic Material and the same bearing bearing ring one the magnetic Coupling provided between the same reducing coating is. This coating can, for example, be sprayed on, be formed thermoplastic layer.

What As far as the sensor is concerned, it is provided that this means Known mechanical fasteners and / or material fit, preferably by gluing, on the other bearing ring or one to the rolling bearing is defined adjacent component.

Further the sensor can depend on from the chosen one Training and arrangement of the recess or groove a radial or have axial scanning direction.

Finally will suggested that the annular Recess or groove preferably on the rotating bearing ring and the Sensor on the fixed bearing ring of the rolling bearing or on a rolling bearing are arranged adjacent component.

Brief description of the drawings

The The invention will be described below with reference to the accompanying drawings an embodiment explained in more detail. The single figure shows schematically a shaft supported by a trained according to the invention roller bearing in an axial section.

Detailed description the drawings

Accordingly, in the drawing figure is a double-row roller bearing 1 shown, which on a shaft 2 is arranged and a radially outer bearing ring 3 as well as two radially inner bearing rings 4a and 4b having. Between these bearing rings 3 ; 4a . 4b are in two rows of rolling elements 5a . 5b Balls led as rolling elements. The two inner bearing rings 4a . 4b are by means of one on the shaft 2 screwed threaded nut 6 against a board 7 the wave 2 fixed axially.

As already mentioned in the introduction, it can be an advantage to work directly on the roller bearing 1 make a speed and / or rotation angle measurement. According to the invention, this is an angle encoder 8th provided for detecting the angular position and / or the relative rotational speed between the mutually corresponding bearing rings 3 . 4a serves.

This angle encoder 8th is on the one hand by a plastic-bonded, ferromagnetic material 9 formed, which in an annular recess 10 of the inner bearing ring 4a is included. The plastic-bonded, ferromagnetic material 9 can do it within the recess 10 be formed as a closed or as multiple, forming individual ring sections, interrupted ring.

On the other hand, this angle encoder includes 8th a sensor known per se 11 , the plastic-bonded, ferromagnetic material 9 assigned. This sensor 11 is suitable for detecting changing magnetic field strengths and generating suitable electrical signals, as well as for providing an evaluation device (not shown but known per se) for evaluation.

As the sole figure further shows, the annular recess 10 including the formed ring of plastic-bonded, ferromagnetic material 9 in an end-side section of the lateral surface of the left bearing ring 4a arranged, whereby a simple and inexpensive production is possible.

Due to this advantageous embodiment of the bearing ring 4a or the arrangement of the ring formed from plastic-bonded, ferromagnetic material 9 can, depending on the current space requirements, the scanning direction of the sensor 11 be chosen so that either in the radial direction or in the axial direction, a detection of the changing magnetic field strength at each revolution is possible.

In contrast, it may also be appropriate, instead of at least one recess 10 one or more annular grooves for receiving the plastic-bonded, ferromagnetic material 9 in a rotatable bearing ring 4a . 4b provide, which are introduced into the end face or the lateral surface of the bearing ring (not shown in detail).

Preferably, the plastic-bonded, ferromagnetic material 9 after a known injection molding in the recess 10 or groove introduced, whereby extremely easy a material and / or positive connection between the formed ring of plastic-bonded, ferromagnetic material 9 and the relevant bearing ring 4a can be generated. However, the invention is not limited to this type of attachment of the formed ring of plastic-bonded, ferromagnetic material 9 but includes any other appropriate action.

Thus, for example, a plurality of separate ring sections can be taken in advance and, forming a closed or partially interrupted ring, within the recess 10 or groove cohesively by, for example, gluing and / or positively locking and / or be determined by means of known mechanical fasteners.

The named plastic-bonded, ferromagnetic material 9 is magnetizable with a pole pair "1" or a multiple thereof, wherein the magnetization expediently during the injection of the same into the recess 10 or groove is realized by means of the selected per se known injection molding tool.

Of Furthermore, the magnetization can also after the actual injection process be performed, which accordingly also is detected by the invention.

Become In contrast, Pre-fabricated ring sections used, so it can be prove appropriate, the same already magnetized to assemble.

As can be seen from the single figure, it has proved to be particularly advantageous between the plastic-bonded, ferromagnetic material 9 and the same bearing bearing ring 4a a magnetic coupling between the same reducing coating 12 provided in order to avoid a falsification of the measurement result.

This coating 12 is preferably formed by a aufspritzbare, thermoplastic resin layer, which advantageously with the then sprayed thereon plastic-bonded, ferromagnetic material 9 a cohesive connection is received. Likewise, film-like coatings 12 , Paints and the like can be used for this purpose.

What the sensor 11 As far as this is on the outer bearing ring 3 by means of known mechanical fastening means, in this case by means of one or more screw connections 13 , set. The actual scanning head 11a of the sensor 11 is in the embodiment shown radially through a through hole in the outer bearing ring 3 passed, and the plastic-bonded, ferromagnetic material 9 of the inner bearing ring 4a aligned.

Certainly there are many other arrangements of the sensor 11 possible. So this example, for example, on the bearing ring 3 be attached to it axially, ie on the front side of the bearing ring 4a or on its plastic-bonded, ferromagnetic material 9 is mounted aligned.

The embodiment shown focuses on an angle encoder 8th whose plastic-bonded, ferromagnetic material 9 on an inner bearing ring 4a or 4b and the sensor 11 on an outer bearing ring 3 are fixed. Also possible is an arrangement, not shown, according to which the plastic-bonded, ferromagnetic material 9 on a radially outer bearing ring 3 and the sensor 11 on a radially inner bearing ring 4a or 4b are fixed. Furthermore, it is detected by the invention that the sensor 11 at one to the rolling bearing 1 can be fixed adjacent component.

It is further considered appropriate if the annular recess 10 or groove on the rotating bearing ring 4a present one with a rotating shaft 2 connected inside bearing ring 4a , and the sensor 11 on fixed bearing ring 3 , in this case the outer bearing ring 3 of the rolling bearing 1 or at a not shown in detail, to the rolling bearing 1 adjacent arranged component, such as a load-bearing component, are fixed, as a result, a simple electrical connection between the sensor 11 and an evaluation unit can be realized.

1

roller bearing

2

wave

3

bearing ring (Outside)

4a

bearing ring (Inside)

4b

bearing ring (Inside)

5a

rolling body row

5b

rolling body row

6

threaded nut

7

shelf

8th

angle encoder

9

ferromagnetic material

10

recess

11

sensor

11a

scan head

12

coating

13

screw

Claims (12)

Roller bearing ( 1 ), with at least one first radially outer bearing ring ( 3 ) and at least one second radially inner bearing ring ( 4a . 4b ), with at least one between them in runways rolling elements series ( 5a . 5b ) and at least one angle sensor ( 8th ) to record the Angular position and / or the relative rotational speed between the mutually corresponding bearing rings ( 3 ; 4a . 4b ), wherein the at least one angle sensor ( 8th ) on the one hand a plastic-bonded, ferromagnetic material ( 9 ), which in an annular recess ( 10 ) or groove of a bearing ring ( 4a ), and on the other hand at least one, the plastic-bonded, ferromagnetic material ( 9 assigned sensor ( 11 ), which at the other bearing ring ( 3 ) or on a to the rolling bearing ( 1 ) is supported adjacent component. Rolling bearing according to claim 1, characterized in that the annular recess ( 10 ) or groove within a lateral surface and / or an end face of the respective bearing ring ( 4a ) is arranged. Rolling bearing according to claim 1 or 2, characterized in that the plastic-bonded, ferromagnetic material ( 9 ), a material and / or positive connection with the respective bearing ring ( 4a ) in detail, in an injection molding in the annular recess ( 10 ) or groove is introduced. Rolling bearing according to claim 3, characterized in that the magnetization of the plastic-bonded, ferromagnetic material ( 9 ) while injecting it into the recess ( 10 ) or groove is performed by means of the injection molding tool or in a separate step after performing the injection process. Rolling bearing according to claim 1 or 2, characterized in that a plurality of previously separately manufactured ring sections of ferromagnetic material ( 9 ) within the recess ( 10 ) or groove material and / or positive locking and / or fixed by means of known mechanical fasteners. roller bearing according to claim 5, characterized in that the separately produced Ring sections are magnetizable before or after their assembly. Rolling bearing according to at least one of claims 1 to 6, characterized in that the ferromagnetic material ( 9 ), forming an angular scale, is magnetized with a pole pair number "1" or a multiple thereof. Rolling bearing according to at least one of claims 1 to 7, characterized in that between the plastic-bonded, ferromagnetic material ( 9 ) and the same bearing bearing ring ( 4a ) a magnetic coupling between the same reducing coating ( 12 ) is provided. Rolling bearing according to claim 8, characterized in that the coating ( 12 ) is formed by a aufspritzbare, thermoplastic resin layer. Rolling bearing according to at least one of claims 1 to 9, characterized in that the sensor ( 11 ) by means of mechanical fastening means and / or materially bonded, for example by gluing, on the other bearing ring ( 3 ) or on a to the rolling bearing ( 1 ) is defined adjacent component. Rolling bearing according to at least one of claims 1 to 10, characterized in that the sensor ( 11 ) depending on the selected configuration and arrangement of the recess ( 10 ) or groove has a radial or axial scanning direction. Rolling bearing according to at least one of claims 1 to 11, characterized in that the annular recess ( 10 ) or groove on the rotating bearing ring ( 4a ) and the sensor ( 11 ) on the fixed bearing ring ( 3 ) of the rolling bearing ( 1 ) or on a to the rolling bearing ( 1 ) are arranged adjacent component, or vice versa.